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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd73bfe9ccaf196193658b6e0e0d2c0a8197acd42d9c0b52fecb42cbf3eea4598' 
  AND token = 'pZlO+IZ/vVnlSeyOK3mFoM2dcHNJC/ZPsnFz8aHATxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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