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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee20d416a1a06a1c6349ee4a9f1444c46ca28f81160f546e53d1585f43619585' 
  AND token = 'lxHZ4DeYPUNQY1AqYDsu1bEyBBr5gJlad7NjnP8gsog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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