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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '140da2bb42924a17fd2b9a33f8ce80ea71ad4f6227292a8bca62b0b86fa7bb85' 
  AND token = 'qZ6pO2+UQ5caskCxDLkcQOVE4CSA1roJUsk6kXvq3iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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