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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1572e7bc32b01ab81ccbfb38459d3470d212bda76520e785acbc0b4ac59e99e' 
  AND token = 'ZFe5zUAKqrZb4A4LWYz/6Fmd2iL0w2aYP/dC/ocP3oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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