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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe78c7d8a74dc5c77e566ab2ae335da97e3fb835f39121ec87a55b21f0c03a0c' 
  AND token = 'Hp56vtF3eOFigHSWKc9elvL0HbMoLgF6r3JFefiNM6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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