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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4e344edeb1eda0d8a18cf5873addb793a41eb986bb84e583c10383045dca44d' 
  AND token = 'DmE/ZNHU/nhx1ZzZc2Xr7RJAJJgyqFE0yFjm72fh8H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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