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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3d6a7b01d04e22194fbc82e316b8850c58ad4665b53c2ce521b1e1572ffbca7' 
  AND token = 'csTLEbTJ6olffukcaQQPcXOBgXPu3mndet865ZaEHMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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