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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2d6c3523be234164e3bd643b9224716ecfcf943722e97fd4f040f20b052b24' 
  AND token = '2Ylx/Eitim+rtfc+HPwrdBGWQ/iOf7KSTDGriLChjTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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