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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a62511c670fc9331587ccf1e588e946fb5d26e6fa91f25412b6d4206e3e3b678' 
  AND token = 'fwLRkawOOdq3iMRij6Lqs8A8TKrOLThGW+HCikGph8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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