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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d2bc0db139f69e48bdda923e77ab4e33aba64c537dad4bfbf365e72c6ec6ba1' 
  AND token = '+bj+qqRVAqPKfUefd+5zaIzwRsAxrji8vUWt5XyMwy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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