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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '060db11e55c262496b0a929b2f507f9cfe5a152639fe372693b34e44b24413c8' 
  AND token = 'RZ2bbSnF4HWtfuV/TqgteNa4PB/knzFIw6fjyVy2EBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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