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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b54c0358618008962609a9dacfe4e7860f27100b4cf854940314f356d0c369c0' 
  AND token = 'npn/2SE+aMOEEq6/8nopyAk3qRpbAiXBixv/+DOy2rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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