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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0aaad46b1a6b82539c0cf25e22a281062e5a11981e83e9d84d8ab6e7e47ebe3' 
  AND token = 'YA1AmV2xzlc7L6qqdNQdoKa5QjEJDcXdqpPUIaphA0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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