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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '713683fab3dc92b62807156fc0c5c15ddc6600b325f1b411ea7e4cc44a1b7af0' 
  AND token = 'FdexsrXZ6pXKXt0KuSPPt/KRBzezfcbi2aFxytD4tSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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