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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7dc666161ebed6f6fe377c4bf3bf417b211535aea1f591824feed1da463f1431' 
  AND token = 'z/P/7O+DuUnkdLH27gPiEyFvXNWLM+yqqXE/O5JsVWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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