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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60bd00bc0ba60595912693f27c47f767f71e2ebf040abb3e2a55bf06c9639224' 
  AND token = 'iHoQbpWkPeqsT/phwUcrsP7RzFQEn8TOopJTocotemo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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