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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e74368a911e0e6a89c8a73cc6ed7845e6711077d56fbb6297a416a7473febde' 
  AND token = 'SZ6ROTCntVfF+iPihqllSZnP6nDjdaa4FOZTvIDkVlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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