SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a3ded907c56b698180ea0090d910b2d849fe393b2d050a3f486f193da396215' 
  AND token = 'vhvQGey2PJiBY7mzjYR75QXe3LuxW9HUNAI7ax04zmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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