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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5af414c8f39be57a25cc78b040b8f39adbbea32b1c4fab8f84c6543f1ad93ad0' 
  AND token = '7wB5m/Zo7pZwcepUBUKm6cylcuLCUhDhAuboFEpt0YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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