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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '423a8d9164725fe5f8e65e3b38352d2e2e293a9ef58331581f4b28e76eabdcb6' 
  AND token = '8tF8s+yeAPORXTx/qDesjHnvTGYDNvhshiEOyVG9454=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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