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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41178beb797401a39cbfb45e47a3a0c3d66468fb3ed487c1e7d221324402c80a' 
  AND token = 'TpTbHVbNbntuzfid18k3T5/ezdmSaZJ61ECl8Usw+Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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