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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f81210b7ccce4a37e3c0a2bccec5e991167640308ea875cd19a25c0923a3a03' 
  AND token = '8xqrtK/S08p61O1gdIprX5WOejxO8LVhdeIpHoolAKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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