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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c6192b139d12fbd82950ff322eb929dcddfb4981694b14ff7d1c4d7e853c101' 
  AND token = 'uLXQH8eRQHHMiqwyJ+pdV1LEV3bEPqTgnp4jyC7gAbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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