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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dd2e38ea49ae7154b0422a722f79c8ae947673d12dbf97c9198ec3d67e4064c' 
  AND token = 'SC7OSVW2GAlFoG6U9PlSTT6nHO+tc2xXIUxMRdBt76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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