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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '296c987f25c355fd86cb9a56c4b1ae9bfb0df8c75fb7a184a1e0d9735611f69f' 
  AND token = 'IiksvP+MbCCCVdoFmeDV8UxHlcsQ9nmegxI3nHUA69Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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