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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '702781bab907db83db9dee371ad01ab7f37dd42e6e3a6e4f19a81fbe8f9f842a' 
  AND token = 'O0BxR1D4qURE3hARAH8gws4tNRc7S+cCDDxMEFDb6VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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