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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb9ca0b18b48efaa17b267df661c9c9a31a099b1fa615abea4e5aea7b1b43848' 
  AND token = 'aQAw+SgS0rcxOD1egMzhIpRu6PiFio3qLk/Z9t+fS5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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