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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0f5e3036a53e3a5cead738f8ad02ea4147b49a3511ce4669b44883b85c7a690' 
  AND token = 'k0imnJ4VeJH1IpfV3L3qxZkJ2GT5ICMHZRNsMzs6siU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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