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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '647c5aa3a5e7556e7d6895b5d34ade2c89d857876c05317d333fa0b374832bd8' 
  AND token = 'YFuzpSmlXxBFhcx++eSL/trwLIuOqq90ol60Nclh1mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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