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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e021ae8b307b49d5a62ed70656865b1ee790d56b9c2eda4f57b2b33193d09bf9' 
  AND token = 'PTqBaDV7TgYOA49ukkldXxqdca+mLy4XtnHVHmZrBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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