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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '432fc4a7d253fe463d3cd1f75d9ba4066cf25ebe0c07dcefaaa33d7b13d437c9' 
  AND token = 'l/t9/LtNxl1mCKZzZE2QmQPM+Xvrb4ciLLO6laUkCdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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