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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db1b3de220f669a6fcfcf34027a18097e0b1b348db7f0f456bf011e53d9af53c' 
  AND token = 'vcsPSBimzuc5gMjdDhyoc5uIZrfDYHRe7fGWd4HJtWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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