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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f3358768a516fd391255807887598cca3fee87befb10f061c1f9edaa11f6f3' 
  AND token = 'C7zu8mBS31EmyO0eQG1EGihOEMbklnItDzTcDeoiYvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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