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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92c3108a576e43494ca5d5258cbf2fede1c619611c5ba1a542c93752de38660a' 
  AND token = 'sj0xTbM6OwMDWvbS5smrtem9+xEf73bVt3vg+EmbP7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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