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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c45676114c2a64f9824d1169fb3c77eb3a4a294615a1243a502a2aa273cf1ef' 
  AND token = 'bFIx3l5qzVoStinakMscUG/gOSvocDbNPpMtIv4HNjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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