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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f833eda61bd3927a0002a7b689e6c96e8aa5689ada19489b3debaa2a59ed42c' 
  AND token = 'sl8BO/I8ffS09E0yaW190S5s5aKdwn1Dfyq0a1EfQuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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