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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ac918f8303be076bc2a4a76e68c6d8e41fa26c6a812e25604b97e210f875ee0' 
  AND token = 'zCuyU1aY9vCSpVfuqivr0DMyEj4pf/mKt4V7Q/VxooA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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