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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b00bbe1d3b0a485606a803d1c22ed5332bf79e62f1c96f22ca03f8860ee4244' 
  AND token = 'W9MfOaFClCto57bYF0PN+o3U0h/bLaVGeAdDYgreunQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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