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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '145988fc65f5e9160b9b34fe26961c365ce0fbba6b7157697c121e5d7dd9f5ac' 
  AND token = 'OOSKPsXwzt5J/+ors/RortdfRG+HMNlqo7Awmso0q6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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