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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0513ae1b46b21e5cef13fdf659b5f06e366e904236e8a4c5e99f2a28acc831d7' 
  AND token = '6zk8lNhGQA4Bx6pOLDwJ9dGO6ThTk4AMe55wQc/U6fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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