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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7de2a77c644689633405241387bdca946a837b66114f5ad412250456428652c2' 
  AND token = 'FnNczM6AjBIGqF0OX9xfJmsOrfNmzJu2xA0XNhNcB/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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