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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edbb86928e835d70c4680948630cf8094052efdb10c0dc43dbfc1f0c25d83891' 
  AND token = 'r8aLARIg7sIjBi1VIysKfO6MXZBTZIp4Hubnz1FvDDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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