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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c3c757761c6c9268cf587389489bac84144780f32edd76ea3635d5d5b7780b5' 
  AND token = 'khzkQu74w67SLnLMjUH0cSNp3ByURw0ZyduVvaQqoWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}