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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cad28cd6aac8d86cb91cbe3255be7645c1dab192ef763ae914916f7a40220ad9' 
  AND token = 'dKzn89Y6S0pcc5rqEJhCQCKvQqfXUCl8XHvGkmClAN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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