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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2ae3b2de05c718d56a763a3e2121e1532725c2a3554ceedf209ae93c6a63703' 
  AND token = 'Qz0RJ97YCoWzuINtGG7eQsJalw9vkrb7UrkWZU6Yecc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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