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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c755a54b5ebc9aecc9d0fb6f03b9a5fe4b447a8e0c8c5c351fba61a55b65f188' 
  AND token = 'DbwVlTPiP3V/oUs9EgnF8WR2rf5JGJ08b0jd/qL55RI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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