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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5225c82dbd9e2b68712135110b2397d4647d9e585d037d1e961ba41dd631ed3' 
  AND token = 'PUMFJ3L0PefmGn3MVKDGkAibYMQUB5xy/mze9THPTKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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