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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a909d74dca08d8bb8c971008a3929c78ed355c955ea0c080707a6915518c081' 
  AND token = 'CGx8JM75xl0aZrZxrOyoIE/eydW0G7EMRYgYfH7ec4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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