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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9b1a81b463d01fc01002ca90006f8cd18766782be3b11cca9937ba559bd586' 
  AND token = '3XYeqJteG34u63Dx0J2M5zEjttQ+hP3Pcy+kr/DaNtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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