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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fde9f37192c3c0298af7a72f950a98262d547df3851516fb8cb52caf05232367' 
  AND token = 'UDdWC5TUcHdEkjiWl5qw4osbHYdWV/ELmMyCrHdVlbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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