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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c6dba8c95f05f71297770be138df28e50ffc4384a6d5ad01fa79cde4875e574' 
  AND token = 'y4U+7euS9uUmFFdd0fT3LinBG89RbI5A8EIrxVZaPSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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