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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c4536a5ed5272808854a5a3a7f99b1602bdf6c5fadee68fdce5f01e2275753f' 
  AND token = '9yvGurgJYDtW2P5OPep93ry66LO7x6eAabbY+J5nvAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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