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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdac8deff6f8f00ee694f5b82172758d74cc5d844562187981f1d1b700a443c9' 
  AND token = 'HkaGyS35jX0R+rc/7oBZrFbUF0QBuUyQnJ583/uhrys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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