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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28a015b4b09062fa6d2536d42c38e794fdab7c5ba26f491b230e0f4c0d37e7e3' 
  AND token = 'JkkbQBUUFCaXVVcmhlIWmIx1DvXxPhdUEoxXnBaYv2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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